/*
 * Copyright © 2015 The Gravitee team (http://gravitee.io)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.gravitee.definition.jackson.datatype.api.deser;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.deser.std.StdScalarDeserializer;
import com.fasterxml.jackson.databind.jsontype.TypeDeserializer;
import java.io.IOException;

/**
 * @author David BRASSELY (david.brassely at graviteesource.com)
 * @author GraviteeSource Team
 */
public abstract class AbstractStdScalarDeserializer<T> extends StdScalarDeserializer<T> {

    protected AbstractStdScalarDeserializer(Class<?> vc) {
        super(vc);
    }

    protected String readStringValue(JsonNode rootNode, String fieldName) {
        return readStringValue(rootNode, fieldName, null);
    }

    protected String readStringValue(JsonNode rootNode, String fieldName, String defaultValue) {
        JsonNode fieldNode = rootNode.get(fieldName);
        if (fieldNode != null) {
            return fieldNode.asText();
        }

        return defaultValue;
    }

    @Override
    public Object deserializeWithType(JsonParser p, DeserializationContext ctxt, TypeDeserializer typeDeserializer) throws IOException {
        return deserialize(p, ctxt);
    }
}
